Calvin Klein isn’t feeling too lonely after splitting with his troubled boy-toy lover, Nick Gruber. Spies said the designer was “swarmed by young male models hoping to be his next boyfriend,” at the Top of the Standard on Wednesday night. The source added, “They were throwing themselves at him, but Calvin didn’t seem at all fazed. He was hanging out with Donna Karan, who seemed to find it all very amusing.” Klein and Gruber split earlier this year.